[gcr] gck: Add gck_attribute_hash and cleanup for use in hash table

[Stefan Walter <stefw src gnome org>]

commit 8667b2f7756b42a570ef1328d3f4658da7dffb3f
Author: Stef Walter <stefw collabora co uk>
Date:   Thu Nov 3 14:32:31 2011 +0100

    gck: Add gck_attribute_hash and cleanup for use in hash table
    
     * Add gck_attribute_hash() so GckAttribute can be used as a
       hash table key.
     * Change gck_attribute_free() and gck_attribute_equal() to use
       pointers so they can be used as GEqualFunc and GDestroyNotify
       without casting

 docs/reference/gck/gck-sections.txt |    1 +
 gck/gck-attributes.c                |   47 ++++++++++++++++++++++++++--------
 gck/gck.h                           |    8 +++--
 3 files changed, 42 insertions(+), 14 deletions(-)
---
diff --git a/docs/reference/gck/gck-sections.txt b/docs/reference/gck/gck-sections.txt
index da8cab5..266d286 100644
--- a/docs/reference/gck/gck-sections.txt
+++ b/docs/reference/gck/gck-sections.txt
@@ -26,6 +26,7 @@ gck_attribute_clear
 gck_attribute_free
 gck_attribute_dump
 gck_attribute_equal
+gck_attribute_hash
 <SUBSECTION Private>
 GCK_TYPE_ATTRIBUTE
 gck_attribute_get_type
diff --git a/gck/gck-attributes.c b/gck/gck-attributes.c
index cb48ca1..6f3b2ec 100644
--- a/gck/gck-attributes.c
+++ b/gck/gck-attributes.c
@@ -641,39 +641,41 @@ gck_attribute_clear (GckAttribute *attr)
 
 /**
  * gck_attribute_free:
- * @attr: Attribute to free.
+ * @attr: (type Gck.Attribute): attribute to free
  *
  * Free an attribute and its allocated memory. These is usually
  * used with attributes that are allocated by gck_attribute_new()
  * or a similar function.
  **/
 void
-gck_attribute_free (GckAttribute *attr)
+gck_attribute_free (gpointer attr)
 {
+	GckAttribute *a = attr;
 	if (attr) {
-		attribute_clear (attr, g_realloc);
-		g_slice_free (GckAttribute, attr);
+		attribute_clear (a, g_realloc);
+		g_slice_free (GckAttribute, a);
 	}
 }
 
 /**
  * gck_attribute_equal:
- * @a: (type Gck.Attribute): first attribute to compare
- * @b: (type Gck.Attribute): second attribute to compare
+ * @attr1: (type Gck.Attribute): first attribute to compare
+ * @attr2: (type Gck.Attribute): second attribute to compare
  *
  * Compare two attributes. Useful with <code>GHashTable</code>.
  *
  * Returns: %TRUE if the attributes are equal.
  */
 gboolean
-gck_attribute_equal (gconstpointer a, gconstpointer b)
+gck_attribute_equal (gconstpointer attr1,
+                     gconstpointer attr2)
 {
-	const GckAttribute *aa = a;
-	const GckAttribute *ab = b;
+	const GckAttribute *aa = attr1;
+	const GckAttribute *ab = attr2;
 
-	if (!a && !b)
+	if (!aa && !ab)
 		return TRUE;
-	if (!a || !b)
+	if (!aa || !ab)
 		return FALSE;
 
 	if (aa->type != ab->type)
@@ -688,6 +690,29 @@ gck_attribute_equal (gconstpointer a, gconstpointer b)
 }
 
 /**
+ * gck_attribute_hash:
+ * @attr: (type Gck.Attribute): attribute to hash
+ *
+ * Hash an attribute for use in <code>GHashTable</code> keys.
+ *
+ * Returns: the hash code
+ */
+guint
+gck_attribute_hash (gconstpointer attr)
+{
+	const GckAttribute *a = attr;
+	const signed char *p, *e;
+	guint32 h = 5381;
+
+	h ^= _gck_ulong_hash (&a->type);
+
+	for (p = (signed char *)a->value, e = p + a->length; p != e; p++)
+		h = (h << 5) + h + *p;
+
+	return h;
+}
+
+/**
  * SECTION:gck-attributes
  * @title: GckAttributes
  * @short_description: A set of PKCS11 attributes.
diff --git a/gck/gck.h b/gck/gck.h
index 42b16e2..e9dbf9b 100644
--- a/gck/gck.h
+++ b/gck/gck.h
@@ -174,14 +174,16 @@ gchar*              gck_attribute_get_string                (GckAttribute *attr)
 void                gck_attribute_get_date                  (GckAttribute *attr,
                                                              GDate* value);
 
-gboolean            gck_attribute_equal                     (gconstpointer a,
-                                                             gconstpointer b);
+gboolean            gck_attribute_equal                     (gconstpointer attr1,
+                                                             gconstpointer attr2);
+
+guint               gck_attribute_hash                      (gconstpointer attr);
 
 GckAttribute*       gck_attribute_dup                       (GckAttribute *attr);
 
 void                gck_attribute_clear                     (GckAttribute *attr);
 
-void                gck_attribute_free                      (GckAttribute *attr);
+void                gck_attribute_free                      (gpointer attr);
 
 void                gck_attribute_dump                      (GckAttribute *attr);